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Finding the Fourth Proportional to 286.41, 428.90 and 141.75

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Solution

The fourth proportional to 286.41, 428.90 and 141.75 is: 212.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.41 : 428.90 = 141.75 : x
  2. Step 2: Convert to fraction form
    286.41/428.90 = 141.75/x
  3. Step 3: Cross multiply
    286.41x = 428.90 × 141.75
  4. Step 4: Simplify right side
    286.41x = 60,795.87
  5. Step 5: Solve for x
    x = 60,795.87/286.41
  6. Step 6: Final answer
    x = 212.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.